Title: Triose phosphate limitation in photosynthesis models reduces leaf photosynthesis and global terrestrial carbon storage

Abstract

Triose phosphate utilization (TPU)-limited photosynthesis occurs when carbon export from the Calvin-Benson cycle cannot keep pace with carbon inputs and processing. This condition is poorly constrained by observations but may become an increasingly important driver of global carbon cycling under future climate scenarios. However, the consequences of including or omitting TPU limitation in models have seldom been quantified. In this work, we assess the impact of changing the representation of TPU limitation on leaf- and global-scale processes. At the leaf scale, TPU limits photosynthesis at cold temperatures, high CO₂ concentrations, and high light levels. Consistent with leaf-scale results, global simulations using the Community Land Model version 4.5 illustrate that the standard representation of TPU limits carbon gain under present day and future conditions, most consistently at high latitudes. If the assumed TPU limitation is doubled, further restricting photosynthesis, terrestrial ecosystem carbon pools are reduced by 9 Pg by 2100 under a business-as-usual scenario. The impact of TPU limitation on global terrestrial carbon gain suggests that CO₂ concentrations may increase more than expected if models omit TPU limitation, and highlights the need to better understand when TPU limitation is important, including variation among different plant types and acclimation to temperature andmore » CO₂.« less

Authors:

Lombardozzi, Danica L. ;

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Smith, Nicholas G.; Cheng, Susan J.; Dukes, Jeffrey S.; Sharkey, Thomas D.; Rogers, Alistair; Fisher, Rosie; Bonan, Gordon B.

Publication Date:

Tue Jul 10 00:00:00 EDT 2018

Research Org.:

Univ. of Michigan, Ann Arbor, MI (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States); Michigan State Univ., East Lansing, MI (United States)

Sponsoring Org.:

USDOE Office of Science (SC), Biological and Environmental Research (BER); USDA; National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES); National Institute of Food and Agriculture (NIFA)

OSTI Identifier:

1459720

Alternate Identifier(s):

OSTI ID: 1459167; OSTI ID: 1603664

Report Number(s):

BNL-206806-2018-JAAM
Journal ID: ISSN 1748-9326

Grant/Contract Number:  

FC03-97ER62402/A010; FG02-91ER2002; SC0012704; SC0012972; 2015-67003-23485; FC03-97ER62402/377 A010; 2015-67003-23489; 1049033; 1000026; FG02-91ER20021

Resource Type:

Published Article

Journal Name:

Environmental Research Letters

Additional Journal Information:

Journal Name: Environmental Research Letters Journal Volume: 13 Journal Issue: 7; Journal ID: ISSN 1748-9326

Publisher:

IOP Publishing

Country of Publication:

United Kingdom

Language:

English

Subject:

54 ENVIRONMENTAL SCIENCES; triose phosphate utilization; terrestrial carbon storage; photosynthesis models